title: Triplex ultrasound of vertebral artery flow during cervical rotation.
abstract: BACKGROUND
  Reviewing the literature on vertebral artery flow during cervical rotation shows various results. Furthermore, most studies have investigated exclusively the effects of contralateral rotation employing less-than-optimal Doppler ultrasound technique.
  
  
  OBJECTIVE
  The aim of this study was to use the latest advancement in Doppler ultrasound technology to investigate flow velocity in the vertebral artery during both ipsilateral and contralateral cervical rotation in normal subjects.
  
  
  METHODS
  A prospective, controlled study in a university hospital vascular laboratory.
  
  
  METHODS
  Twenty healthy university students.
  
  
  RESULTS
  Peak flow velocity decreased significantly during contralateral rotation and increased significantly during ipsilateral rotation. The differences, however, were modest. We found no correlation between peak flow velocity and systolic blood pressure.
  
  
  CONCLUSIONS
  With modern Doppler ultrasound technique, preventing some sources of error in measuring, our finding during contralateral rotation were in accordance with most previous studies showing a decrease in peak flow velocity. For the first time, however, we report an increased flow velocity in the vertebral artery during ipsilateral rotation.
authors.affiliation: Department of Clinical Physiology and Nuclear Medicine, Odense University Hospital, Denmark.
authors.forename: P B
authors.initials: PB
authors.lastname: Licht
authors.forename: H W
authors.initials: HW
authors.lastname: Christensen
authors.forename: P
authors.initials: P
authors.lastname: Højgaard
authors.forename: P F
authors.initials: PF
authors.lastname: Høilund-Carlsen
mesh_terms: D000328:Adult; D001794:Blood Pressure / Q000502:physiology; D002574:Cervical Vertebrae / Q000502:physiology*; D002684:Chiropractic; D005260:Female; D006257:Head / Q000502:physiology; D006801:Humans; D008297:Male; D009068:Movement / Q000502:physiology*; D011446:Prospective Studies; D012399:Rotation; D014463:Ultrasonography; D014711:Vertebral Artery / Q000000981:diagnostic imaging* / Q000502:physiology